Transect Total Nitrogen in Soil

Study number: 

400

Data set ID: 

210400004

Data Access: 

Unrestricted

Dataset status: 

Date range: 

1985-01-31 to 1986-01-22

Original investigator: 

Peter Wierenga

Data contact: 

Abstract: 

Total nitrogen in soil was determined on control and treatment (fertilized) transects by Kjeldahl digestion.

Total nitrogen in soil was determined on control and treatment (fertilized) transects by Kjeldahl digestion.

Data download: 

Description: 

Data file information for the following Jornada data set: Transect Total Nitrogen in Soil

Methods: 

Lab data sheets

Total N determined by Kjeldahl digestion followed by digest NH4-N determination by an automated salicylate procedure. Two digests were performed for each sample; nitrogen expressed as mg-N/kg oven-dry (50C) soil ground to pass a 0.15 mm sieve

Additional information: 

In the spring of 1982, as part of the establishment of the Jornada Long-Term Ecological Research site in southern New Mexico, a 135 ha portion of a 1500 ha, internally drained, watershed was exclosed from grazing by domestic livestock. Prior to exclosure the watershed, as well as the rest of the Jornada basin, had been moderately to heavily grazed for the past 100 years. Concurrent with grazing, the vegetation had undergone a dramatic change from desert grassland, with an almost continuous cover of C4 perennial grasses, to isolated patches of the original grassland in a mosaic with desert shrub dominated plant communities (Buffington and Herbel, 1965). The exclosure lies along a northeast facing piedmont slope at the base of a steep isolated mountain peak, and covers a variety of component landforms from the foot of the mountain to the basin floor. The northeast side of the exclosure is immediately upslope of the College Playa located near the NMSU College Ranch. Three parallel transects (2.7 km in length) run from the middle of the College Playa up into the foot of Mt. Summerford. The Control transect is to the west, the Treatment transect on the east side of the Control transect, and the Alternate Control to the east of the Treatment transect. Each transect is 30 meters wide with a 45 meter buffer zone between each transect. The Treatment transect was treated annually until 1987 with NHNO3 in a concentration equal to 10g N/m2. The station markers at 30 meter intervals along each transect.

Maintenance: 

Twice

Date Data Last Updated: 

1986-01-22

Signature dataset: 

LTER Core Area(s): 

Data category: 

Research Network: